Watts to Amps Calculator
Convert between watts, amps, and volts.
How It Works
Amps = Watts ÷ Voltage (single-phase) or Watts ÷ (1.732 × Voltage) (three-phase).
Example
2,400 W at 120 V single-phase = 20 A. 10,000 W at 240 V three-phase ≈ 24.1 A.
Frequently Asked Questions
Why multiply by 1.732 for three-phase?
1.732 is the square root of 3, the factor relating line-to-line voltage and three-phase power.
When do I use the three-phase option?
For commercial motors and larger equipment wired on three-phase services.
Does this account for power factor?
No — it assumes a resistive load (power factor = 1). Motors and inductive loads draw more current.